JP2653271B2 - Electric carpet temperature control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the temperature of an electric carpet used for heating by laying on a floor.

[0002]

2. Description of the Related Art Conventionally, as a floor heater, there is a hot carpet in which the temperature is controlled by turning on / off a power supply to a built-in heater. In recent years, in this hot carpet, it is common to use a carpet body having a built-in heater covered with a carpet cover separate from the carpet body.

[0003] In this method of controlling the temperature of an electric carpet, the carpet body is kept warm by the carpet cover, so that there is an advantage that the electricity bill can be saved.

[0004]

However, in this method for controlling the temperature of the electric carpet, it takes time until the heat of the carpet body is transmitted to the surface of the carpet cover after the power is turned on. When the thickness is thick, there is a problem that the rise of the surface temperature of the carpet cover is slow.

In order to solve such a problem, immediately after the power is turned on, the temperature of the carpet body is once increased to a temperature higher than a set off temperature, thereby controlling the temperature of the electric carpet for performing so-called rapid heating. A method is provided. However, in this hot carpet, the temperature of the carpet main body is less likely to decrease than the surface temperature of the carpet cover due to the heat retaining effect of the carpet cover. Therefore, there were the following problems. That is, the temperature of the carpet body shown in FIG. 5 (solid line)
With reference to the change in the surface temperature of the carpet cover (dashed line), after the rapid heating, the power supply to the heater is first turned off (indicated by A in FIG. 5), and then the power supply to the heater is turned on. It takes a long time before it is indicated by B in FIG. Therefore, during this time, the surface temperature of the carpet cover decreases (indicated by C in FIG. 5), and there is a problem that a person is uncomfortable.

Accordingly, an object of the present invention is to solve the above-mentioned technical problems and to provide a method for controlling the temperature of an electric carpet, which can suppress a decrease in surface temperature after so-called rapid heating and does not cause discomfort to humans. It is.

[0007]

According to a first aspect of the present invention, there is provided a method for controlling a temperature of an electric carpet, comprising the steps of:
The first off temperature Tup for turning on / off the power supply to the heater built in the carpet body and turning off the power supply to the heater first after the power is turned on is set to the set off temperature T
In the method for adjusting the temperature of an electric carpet, which is set higher by a predetermined temperature than o, the temperature of the carpet body is gradually set from the first off-temperature Tup to the set off-temperature To.
It is characterized by being close to

Further, it is desirable that the N-th ON temperature Tn at which the heater is turned ON the nth time after the power is turned on is set based on the following equation. Tn = To + (Tup−To) / (n × k) −ΔT where To is the set off temperature, Tup is the first off temperature at which the power supply to the heater is first turned off after the power is turned on, and k is the electric power. A constant, ΔT, obtained by an experiment according to the type of carpet, is a difference between an ON temperature at which energization to the heater is turned ON and an OFF temperature at which energization to the heater is turned OFF next.

[0009]

When the power is turned on, if the temperature is reduced from the first off-temperature, which is higher than the set off-temperature, to the set-off temperature at a stretch, the time during which power to the heater is turned off becomes longer, and the surface temperature becomes lower. In the present invention, since the temperature is gradually lowered from the first OFF temperature to the set OFF temperature, the OFF state of the power supply to the heater does not continue for a long time. Therefore, it is possible to suppress a decrease in surface temperature after rapid heating at the time of power-on.

Further, the n-th heater is turned on for the n-th time.
When the second ON temperature Tn is set based on the above equation, the second term (Tup-To) / (n × k) in the right-hand side of the above equation is used.
Decreases step by step. Along with this, the temperature at which the power supply to the heater is turned on is gradually brought closer to the temperature obtained by subtracting the predetermined temperature ΔT from the set off temperature To, that is, the ON temperature at the time of stable operation. Does not last for a long time. Therefore, it is possible to suppress a decrease in surface temperature after rapid heating at the time of power-on. In addition, since the constant k included in the second term for determining the degree of decrease in the ON temperature is determined by experiment according to the model of the electric carpet, temperature adjustment suitable for the model can be performed.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is an exploded perspective view of an electric carpet to which the temperature control method according to one embodiment of the present invention is applied, and FIG. 3 is a longitudinal sectional view thereof. Referring to these drawings, this electric carpet has a carpet body 1 having a built-in heater 2 made of a planar heating element, a temperature sensor S made of a heat-sensitive wire for detecting the temperature of this carpet body 1, and a temperature sensor S A controller 3 for controlling the temperature of the electric carpet based on the signal from S and a carpet cover 11 that is placed on the upper surface of the carpet body 1 are provided.

FIG. 1 is a schematic diagram showing an electric configuration of an electric carpet. Referring to FIG. 1, heaters 2 are built in heaters 2a, 2b, and 2c, respectively, which are provided for each surface of carpet body 1. It consists of. AC power from an outlet is supplied to the heater 2 via a power switch S1, a fuse 4, a pair of relay contacts 6 opened and closed by a relay coil 5, and a pair of switching devices 7. The relay contact piece 6 interrupts and energizes all heaters 2a, 2b, 2c at the same time. The switching device 7 selectively switches on at least one of the heaters 2a, 2b, 2c by switching the contacts 7a, 7b, 7c by the surface cut switch S2. The AC power supply includes a control circuit 8 built in the controller 3 and a sensor circuit 9.
Is supplied to The sensor circuit 9 receives a signal from the temperature sensor S via the sensor block 10 and outputs a signal corresponding to the detected temperature to the control circuit 8.

The control circuit 8 includes a set-off temperature input section 81 for inputting a set-off temperature To set by a user via an operation switch S3 (see FIG. 2) provided on the controller 1, and An energization control unit 82 that controls energization of the relay coil 5 to turn on or off energization is included. Hereinafter, the temperature at which the power supply to the heater 2 is turned off is simply referred to as an off-temperature, and the temperature at which the power supply to the heater 2 is turned on is referred to as an on-temperature.

The energization control unit 82 sets the first off-temperature Tup after power-on to a value higher than the set off-temperature To by a predetermined temperature (for example, 7 ° C.). Further, a difference ΔT between an ON temperature at which the power supply to the heater 2 is turned on and an OFF temperature at which the power supply to the heater 2 is subsequently turned off is set to, for example, 2 ° C. Further, the n-th ON temperature Tn is calculated by the following equation (1).
Set based on

Tn = To + (Tup−To) / (n × k) −ΔT (1) where k is a constant obtained by experiment according to the model of the electric carpet. That is, the temperature of the carpet body 1 at the time when the surface temperature of the carpet cover 11 has dropped from the first off temperature Tup by, for example, 0.5 ° C. is determined, and this temperature is substituted for Tn in the equation (1). , A constant k is calculated. In the above, 0.5 ° C.
This is because such a reduction does not cause discomfort to the user. As the value of the constant k, for example, a value of about 1.5 to 7 is obtained depending on the thickness, material, and the like of the carpet cover.

Next, the operation of the power supply control unit 82 will be described. First, a first off-temperature Tup that is higher by a predetermined temperature than the set off-temperature To input from the set-off temperature input unit 81 is set. When the power switch S1 is turned on, the power supply to the heater 2 is started, and the carpet body 1 is turned on.
At the time when the temperature becomes the first off-temperature Tup,
The relay piece 6 is opened, and the power supply to the heater 2 is cut off.
Thereafter, the first round of on temperature T _1, T _2, ... _{a, T 1 = To + (Tup} -To) / (1 × k) -ΔT T 2 = To + (Tup-To) / (2 × k _{) -ΔT T 3 = to + (} Tup-to) / (3 × k) -ΔT: calculates as. After the power is turned on, the first and subsequent OFF temperatures and ON temperatures are shown in Table 1 below.

[0017]

[Table 1]

According to this embodiment, after the first energization of the heater 2 is turned off, the energization of the heater 2 is repeatedly turned on and off sequentially, and after the temperature change is stabilized, the off-temperature is reduced. The temperature converges to the set off temperature To, and the on temperature converges to a temperature obtained by subtracting the predetermined temperature ΔT from the set off temperature To. Then, the ON temperature is gradually approached to the above-mentioned temperature obtained by subtracting the predetermined temperature ΔT from the set OFF temperature To, that is, the ON temperature at the time of stability, so that the OFF state of energization to the heater 2 does not continue for a long time. Therefore, it is possible to suppress a decrease in surface temperature after rapid heating at the time of power-on, and it is possible to prevent a person from feeling uncomfortable.

In addition, a constant k included in (Tup-To) / (n × k) of the second term on the right side of the above equation for determining the degree of decrease in the ON temperature is obtained by experiments according to the type of electric carpet. Therefore, temperature adjustment suitable for the model can be performed. <Test Example> Assuming that the set off temperature To is 30 ° C., the first off temperature is 37 ° C., the difference ΔT between the on temperature and the off temperature when the temperature is stable is 2 ° C., and the constant k is 3, the temperature is set. When the adjustment was performed and the surface temperature of the carpet cover 11 was measured, the results shown in FIG. 4 were obtained. However, in the figure,
The temperature detected by the temperature sensor S, that is, the temperature of the carpet body 1 is indicated by a solid line, and the surface temperature of the carpet cover 11 is indicated by a dashed line. The room temperature during the experiment was 17 ° C.

As shown in FIG. 4, after rapid heating, it was proved that the surface temperature quickly stabilized without lowering the surface temperature.

[0021]

As described above, according to the method for controlling the temperature of the electric carpet according to the first aspect, the temperature of the carpet body once started after the power is turned on is gradually brought closer to the set off temperature, so that the heater can be used. The off state does not continue for a long time, and therefore, a decrease in surface temperature after rapid heating can be suppressed, and no discomfort is given to a person.

According to the electric carpet temperature adjusting method of the present invention, the degree of decrease of the ON temperature is determined according to the model of the electric carpet, so that the temperature can be adjusted according to the model.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram of an electric carpet to which a temperature control method of the present invention is applied.

FIG. 2 is an exploded perspective view of the electric carpet.

FIG. 3 is a longitudinal sectional view of the electric carpet.

FIG. 4 is a diagram showing changes in the temperature of the carpet body and the surface temperature of the carpet cover.

FIG. 5 is a diagram showing changes in the temperature of the carpet body and the surface temperature of the carpet cover according to a conventional control method.

[Explanation of symbols]

 1 Carpet Body 2 Heater Tup 1st Off Temperature To Set Off Temperature Tn nth On Temperature

Claims (2)

(57) [Claims] 1. A heater (2) built in a carpet body (1).
The electric carpet in which the first off temperature Tup for turning off the power supply to the heater (2) first after the power is turned on is set to be higher than the set off temperature To by a predetermined temperature while controlling the power supply to the on / off state. In the temperature control method, the temperature of the carpet body (1) is gradually brought closer to the set off temperature To from the first off temperature Tup. 2. The temperature control method for an electric carpet according to claim 1, wherein an N-th ON temperature Tn at which the heater (2) is turned ON for the n-th time after the power is turned on is set based on the following equation. A method for controlling the temperature of an electric carpet, comprising: Tn = To + (Tup−To) / (n × k) −ΔT where To is the set off temperature, Tup is the first off temperature at which the power supply to the heater is first turned off after the power is turned on, and k is the electric power. A constant, ΔT, obtained by an experiment according to the type of carpet, is a difference between an ON temperature at which the power supply to the heater (2) is turned on and an OFF temperature at which the power supply to the heater (2) is turned off.